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IMPACT ANALYSES AND TESTS OF CONCRETE OVERPACKS OF SPENT NUCLEAR FUEL STORAGE CASKS

机译:核燃料贮存罐混凝土外包装的冲击分析和试验

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A concrete cask is an option for spent nuclear fuel interim storage. A concrete cask usually consists of a metallic canister which confines the spent nuclear fuel assemblies and a concrete overpack. When the overpack undergoes a missile impact, which might be caused by a tornado or an aircraft crash, it should sustain an acceptable level of structural integrity so that its radiation shielding capability and the retrievability of the canister are maintained. A missile impact against a concrete overpack produces two damage modes, local damage and global damage. In conventional approaches [1], those two damage modes are decoupled and evaluated separately. The local damage of concrete is usually evaluated by empirical formulas, while the global damage is evaluated by finite element analysis. However, this decoupled approach may lead to a very conservative estimation of both damages. In this research, finite element analysis with material failure models and element erosion is applied to the evaluation of local and global damage of concrete overpacks under high speed missile impacts. Two types of concrete overpacks with different configurations are considered. The numerical simulation results are compared with test results, and it is shown that the finite element analysis predicts both local and global damage qualitatively well, but the quantitative accuracy of the results are highly dependent on the fine-tuning of material and failure parameters.
机译:混凝土罐是核废燃料临时存储的一种选择。混凝土桶通常由金属罐组成,金属罐限制了乏核燃料组件和混凝土外包装。当外包装遭受龙卷风或飞机坠毁可能造成的导弹撞击时,外包装应保持可接受的结构完整性水平,以保持其辐射屏蔽能力和罐的可回收性。导弹撞击混凝土外包装会产生两种损坏模式,即局部损坏和整体损坏。在传统方法[1]中,这两种损坏模式是分离的并分别进行评估。混凝土的局部损伤通常通过经验公式进行评估,而整体损伤则通过有限元分析进行评估。但是,这种分离的方法可能会导致对两种损害的估计都非常保守。在这项研究中,具有材料破坏模型和元素腐蚀的有限元分析被用于评估高速导弹撞击下混凝土外包装的局部和整体损伤。考虑两种具有不同构造的混凝土外包装。将数值模拟结果与测试结果进行了比较,结果表明,有限元分析可以很好地预测局部和整体损伤,但结果的定量准确性高度取决于材料和失效参数的微调。

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